Skip to Main content Skip to Navigation
Journal articles

Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions

Abstract : This paper deals with the modeling of the rheological behavior of polyethylene (PE)/supercritical CO 2 solutions. Melt viscosity measurements were performed using a capillary tube die attached to a twin screw extruder, for different amounts of CO 2 injected into the extruder barrel (from 0 to 4 wt%). The viscosity of the solutions was determined by measuring the pressure drop and the polymer flow rate through the die. A D-optimal experimental design was developed to determine the minimal number of experiments necessary with a minimization of the error on the model coefficients. The experimental results showed that the viscosity of PE/CO 2 solutions depends on shear rate, temperature, pressure, and CO 2 concentration. The pressure in the capillary was modeled by a second order polynomial. A theoretical model based on a power law was proposed to describe the pseudoplastic behavior of PE/CO 2 solutions with different shear rates. Correction factors were included to take into account the effects of temperature, pressure, and CO 2 concentration.
Complete list of metadata

https://hal.univ-lorraine.fr/hal-01629327
Contributor : Sandrine Hoppe <>
Submitted on : Monday, November 6, 2017 - 12:24:21 PM
Last modification on : Friday, February 26, 2021 - 3:36:03 PM

Identifiers

Collections

Citation

M. Nobelen, Sandrine Hoppe, C. Fonteix, Fernand Pla, M. Dupire, et al.. Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions. Chemical Engineering Science, Elsevier, 2006, 61 (16), pp.5334 - 5345. ⟨10.1016/j.ces.2006.03.052⟩. ⟨hal-01629327⟩

Share

Metrics

Record views

380